[21/65] ath9k: fix key allocation error handling for powersave keys

[Steven Rostedt <rostedt@goodmis.org>]

[-- Attachment #1: 0021-ath9k-fix-key-allocation-error-handling-for-powersav.patch --]
[-- Type: text/plain, Size: 1785 bytes --]

3.6.11.5 stable review patch.
If anyone has any objections, please let me know.

------------------

From: Felix Fietkau <nbd@openwrt.org>

[ Upstream commit 4ef69d0394cba8caa9f75d3f2e53429bfb8b3045 ]

If no keycache slots are available, ath_key_config can return -ENOSPC.
If the key index is not checked for errors, it can lead to logspam that
looks like this: "ath: wiphy0: keyreset: keycache entry 228 out of range"
This can cause follow-up errors if the invalid keycache index gets
used for tx.

Cc: stable@vger.kernel.org
Signed-off-by: Felix Fietkau <nbd@openwrt.org>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
---
 drivers/net/wireless/ath/ath9k/main.c |    6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/drivers/net/wireless/ath/ath9k/main.c b/drivers/net/wireless/ath/ath9k/main.c
index 61e08e6..e032723 100644
--- a/drivers/net/wireless/ath/ath9k/main.c
+++ b/drivers/net/wireless/ath/ath9k/main.c
@@ -1292,6 +1292,7 @@ static int ath9k_sta_add(struct ieee80211_hw *hw,
 	struct ath_common *common = ath9k_hw_common(sc->sc_ah);
 	struct ath_node *an = (struct ath_node *) sta->drv_priv;
 	struct ieee80211_key_conf ps_key = { };
+	int key;
 
 	ath_node_attach(sc, sta, vif);
 
@@ -1299,7 +1300,9 @@ static int ath9k_sta_add(struct ieee80211_hw *hw,
 	    vif->type != NL80211_IFTYPE_AP_VLAN)
 		return 0;
 
-	an->ps_key = ath_key_config(common, vif, sta, &ps_key);
+	key = ath_key_config(common, vif, sta, &ps_key);
+	if (key > 0)
+		an->ps_key = key;
 
 	return 0;
 }
@@ -1316,6 +1319,7 @@ static void ath9k_del_ps_key(struct ath_softc *sc,
 	    return;
 
 	ath_key_delete(common, &ps_key);
+	an->ps_key = 0;
 }
 
 static int ath9k_sta_remove(struct ieee80211_hw *hw,
-- 
1.7.10.4